linux-kernel - Re: [PATCH block/for-next v2 07/16] bcachefs: use new helper to get inode from block

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Message-ID: <58ced33e-0a8c-7bd3-beb8-d75119cab60b@huaweicloud.com>
Date:   Mon, 27 Nov 2023 15:52:39 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     Kent Overstreet <kent.overstreet@...ux.dev>,
        Damien Le Moal <dlemoal@...nel.org>
Cc:     Yu Kuai <yukuai1@...weicloud.com>, hch@...radead.org,
        ming.lei@...hat.com, axboe@...nel.dk, roger.pau@...rix.com,
        colyli@...e.de, kent.overstreet@...il.com, joern@...ybastard.org,
        miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        sth@...ux.ibm.com, hoeppner@...ux.ibm.com, hca@...ux.ibm.com,
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        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, linux-bcache@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-s390@...r.kernel.org,
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        yi.zhang@...wei.com, yangerkun@...wei.com,
        "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH block/for-next v2 07/16] bcachefs: use new helper to get
 inode from block_device

Hi,

在 2023/11/27 15:24, Kent Overstreet 写道:
> On Mon, Nov 27, 2023 at 04:09:47PM +0900, Damien Le Moal wrote:
>> On 11/27/23 15:21, Yu Kuai wrote:
>>> From: Yu Kuai <yukuai3@...wei.com>
>>>
>>> Which is more efficiency, and also prepare to remove the field
>>> 'bd_inode' from block_device.
>>>
>>> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
>>> ---
>>>   fs/bcachefs/util.h | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/fs/bcachefs/util.h b/fs/bcachefs/util.h
>>> index 2984b57b2958..fe7ccb3a3517 100644
>>> --- a/fs/bcachefs/util.h
>>> +++ b/fs/bcachefs/util.h
>>> @@ -518,7 +518,7 @@ int bch2_bio_alloc_pages(struct bio *, size_t, gfp_t);
>>>   
>>>   static inline sector_t bdev_sectors(struct block_device *bdev)
>>>   {
>>> -	return bdev->bd_inode->i_size >> 9;
>>> +	return bdev_inode(bdev)->i_size >> 9;
>>
>> shouldn't this use i_size_read() ?
>>
>> I missed the history with this but why not use bdev_nr_sectors() and delete this
>> helper ?
> 
> Actually, this helper seems to be dead code.

Yes, there is no caller of this helper, I'll remove this helper.

Thanks,
Kuai

> .
>